TWI737053B - Device for monitoring and measuring sewing machine and method thereof - Google Patents

Abstract

A device is used for monitoring measuring a sewing machine, wherein the sewing machine has a needle bar, and the needle bar has a moving state. The monitoring and measuring device comprises an optical unit, a position sensor, and an analyzing unit. The optical unit is disposed on the needle bar and projects a light. The position sensor receives the light and generates a coordinate signal which is in response to the light at a specific time. Before the position coordinate signal SR, there is at least one immediately adjacent position coordinate signal SP, and after the position coordinate signal SR, there is at least one immediately adjacent position coordinate signal SQ. According to the position coordinate signal SP and/or SQ, the analysis unit analyzes whether the motion state is normal.

Description

Device for monitoring a sewing machine and monitoring method thereof

The present disclosure relates to a method and device for monitoring the needle bar of a sewing machine, in particular to a method and device for monitoring the movement state of the needle bar of a sewing machine.

The movement of the needle bar of the sewing machine includes two dimensions: up and down and swing. When combined with the forward and backward movement of the cloth ruler, various stitch patterns can be created. If the needle bar fails to operate accurately due to factors such as motor, transmission mechanism or fabric, it will not be able to The preset stitch pattern was successfully completed. Because the needle bar moves fast and it is not easy to monitor, the actual sewing thread of the fabric is used to detect the needle bar movement state. If you need to understand the needle bar movement state in depth, you can use the high-speed camera to obtain the needle bar movement video for analysis, but the high-speed camera is expensive And it is not easy to analyze the needle bar image.

The contents of the US invention patents US4191120, US4275674 and US4308814 are the stepping motor control, microprocessor control and needle bar control of the sewing machine, respectively, and the needle bar monitoring is not involved. The other 5 patents are related to motion monitoring. Chinese invention patents CN202072895U and CN203429397U use an encoder and a Hall-effect sensor to monitor the motion state of the drive motor respectively; CN203668659U uses a Hall-effect sensor to monitor the up and down motion of the needle bar; the United States The invention patent US3738296 uses a light sensor to monitor the up and down movement of the needle bar; the US invention patent US4351254 monitors the driving mechanism of the sewing machine. Most of the above-mentioned patents do not directly monitor the movement of the needle bar, and cannot know the actual state of the needle bar; some of the patents that monitor the movement of the needle bar do not monitor the movement of the needle bar at the same time. The needle bar of the sewing machine is in the state of swinging movement, and the movement of the needle bar in two dimensions, up and down and swinging, cannot be measured completely.

In view of the shortcomings of the conventional technology, it is expected to propose a method that can simultaneously monitor the swing motion state of the needle bar of the sewing machine, and can completely measure the movement of the needle bar in two dimensions: up and down and swing.

The present disclosure directly monitors the movement state of the needle bar in two dimensions, up and down and swinging, and the required movement sensing device can be temporarily erected, which is suitable for use in a production tube. The method proposed in this patent can solve the problem of needle bar movement monitoring under the condition of low cost and minimal interference with needle bar movement.

The present disclosure proposes a method for monitoring the movement of the needle bar of a sewing machine. First, a light spot synchronized with the movement state of the needle bar of the sewing machine is generated, and the light spot is projected on the optical position sensor, and then the signal of the position sensor is captured. Real-time monitoring of the high-speed movement of the needle bar.

Based on the above concept, the present disclosure provides a monitoring device for monitoring a sewing machine, wherein the sewing machine has a needle bar, and the needle bar has a movement state, and the monitoring device includes a position sensor, an optical unit, and a fixing device. Mechanism, and a signal processing module. The optical unit projects a light, and the fixing mechanism is used to fix the optical unit to the needle bar, so that when the needle bar moves, the light forms a light spot track on the position sensor, wherein the position sensor The detector converts the light spot trajectory into a position coordinate signal in response to the light spot trajectory. The signal processing module is electrically connected to the position sensor, and analyzes a movement track of the needle bar based on the position coordinate signal.

Based on the above concept, the present disclosure provides a method for monitoring a sewing machine, wherein the sewing machine has a needle bar, and the needle bar has a movement state, and includes an optical unit, a fixing mechanism, a position sensor, and A signal processing module, the method includes the following steps: fixing the optical unit that emits a light to the needle bar through the fixing mechanism, so that the needle bar When moving, the light forms a light spot track on the position sensor: by using the position sensor, the light spot track is converted into a position coordinate signal in response to the light spot track; and in response to the position coordinate signal To analyze a movement trajectory of the needle bar.

Based on the above conception, the present disclosure provides a monitoring method for monitoring a state of a movement of a needle bar of a sewing machine, which includes the following steps: using an optical unit to emit a light that moves with the movement; The light is projected on a position sensor to form a moving light spot so that the position sensor generates a position coordinate signal; and in response to the position coordinate signal, a movement track of the needle bar is analyzed.

Based on the above concept, the present disclosure provides a monitoring device for monitoring a sewing machine, wherein the sewing machine has a needle bar, and the needle bar has a movement state, and the monitoring device includes an optical unit, a position sensor, and a Analysis unit. The optical unit is arranged on the needle bar and projects a light beam. The position sensor receives the light and generates a position coordinate signal that reflects the light at a specific time. Wherein: before the position coordinate signal SR, there is at least one immediately adjacent position coordinate signal SP; after the position coordinate signal SR, there is at least one adjacent position coordinate signal SQ; and according to the position coordinate signal and SP and/or SQ, the The analysis unit analyzes whether the motion state is normal.

Based on the above conception, the present disclosure provides a method for monitoring a sewing machine, wherein the sewing machine has a needle bar, and the needle bar has a movement state, the method includes: projecting a light from the needle bar; receiving the light Generate a position coordinate signal SR that reflects the light at a specific time point, wherein before the position coordinate signal SR, there is at least one immediate position coordinate signal SP, and after the position coordinate signal, there is at least one immediate position coordinate signal SQ; And according to the position coordinate signal and SP and/or SQ, analyze whether the motion state is normal.

10,20‧‧‧Sewing machine

12,14,16,18,19‧‧‧Monitoring device

121,221‧‧‧Needle bar

122,222‧‧‧Position sensor

123,129,131,133,135‧‧‧Optical unit

136,236‧‧‧bur

124,224‧‧‧Fixed mechanism

125,225‧‧‧Signal processing module

126,226‧‧‧Power supply unit

127,227‧‧‧focusing lens

128,228‧‧‧ Lens Hood

1251,2251‧‧‧Signal Extraction Unit

1253,2253‧‧‧Analysis unit

1252,2252‧‧‧Signal processing unit

FWR1, FWR2‧‧‧Flexible wire

LT1, LT2, LT3, LT4, LT5, LT6‧‧‧Light

TRC1, TRC2‧‧‧Spot Track

PL,QL,RL‧‧‧Light spot

P,Q,R‧‧‧Position

SD1(t), SD2(t), SDP, SDQ, SDR‧‧‧Digital signal

SPT1(t),SPT2(t),SP,SQ,SR‧‧‧Position coordinate signal

ACT1, ACT2, ACT3, ACT4‧‧‧Motion status

IMG1, IMG2‧‧‧Spot image

First Figure A: A schematic diagram of a monitoring device for monitoring a sewing machine according to a preferred embodiment of the present disclosure.

Figure 1 B: A schematic diagram of a light spot image formed according to Figure A according to the preferred embodiment of the present disclosure.

Second Figure A: A schematic diagram of another monitoring device for monitoring a sewing machine according to another preferred embodiment of the present disclosure.

Second image B: A schematic diagram of another light spot image formed according to the first image B according to the preferred embodiment of the present disclosure.

Figure 3: A schematic diagram of another monitoring device for monitoring a sewing machine according to another preferred embodiment of the present disclosure.

Figure 4: A schematic diagram of another monitoring device for monitoring a sewing machine according to another preferred embodiment of the present disclosure.

Figure 5: A schematic diagram of another monitoring device for monitoring a sewing machine according to another preferred embodiment of the present disclosure.

Figure 6: A schematic diagram of a method for monitoring a sewing machine according to another preferred embodiment of the present disclosure.

Figure 7: A schematic diagram of a monitoring method for monitoring a movement and a state of a needle bar of a sewing machine according to a preferred embodiment of the present disclosure.

Figure 8: A schematic diagram of a monitoring device for monitoring a sewing machine according to a preferred embodiment of the present disclosure.

Figure 9: A schematic diagram of a method for monitoring a sewing machine according to a preferred embodiment of the present disclosure,

Please refer to the drawings of this creation to read the detailed description below. The drawings of this creation are by way of example to introduce various embodiments of this creation and to understand how to realize this creation. This authoring embodiment provides sufficient content for those skilled in the art To implement the embodiment disclosed in this creation, or implement an embodiment derived from the content disclosed in this creation. It should be noted that these embodiments are not mutually exclusive with each other, and some embodiments can be appropriately combined with one or more other embodiments to form new embodiments, that is, the implementation of this creation is not limited to Examples disclosed below. In addition, for the sake of conciseness and clarity, the relevant details are not excessively disclosed in each embodiment. Even if specific details are disclosed, they are only illustrated to make readers understand. The relevant specific details in each embodiment are not used to limit. The disclosure of this case.

Please refer to the first figure A, which is a schematic diagram of a monitoring device 12 for monitoring a sewing machine 10 according to a preferred embodiment of the present disclosure, wherein the sewing machine 10 has a needle bar 121, and the needle bar 121 has a movement state ACT1, ACT2 The device 12 includes a position sensor 122, an optical unit 123, a fixing mechanism 124, and a signal processing module 125. The optical unit 123 projects a light LT1. The fixing mechanism 124 is used to fix the optical unit 123 to the needle bar 121, so that when the needle bar 121 moves, the light LT1 forms a light spot track TRC1 on the position sensor 122, wherein the position sensor The device 122 converts the light spot trajectory TRC1 into a position coordinate signal SPT1(t) in response to the light spot trajectory TRC1. The signal processing module 125 is electrically connected to the position sensor 122, and analyzes a movement track of the needle bar 121 based on the position coordinate signal SPT1(t).

The configuration of the focusing lens 127 and the position sensor 122 in the first figure A are respectively similar to the configuration of the lens and the photosensitive element in the camera. The imaging IMG1 is projected to the focusing lens 127 by the optical unit 123 and then focused at the position On the sensor 122, it should be noted that the distance between the focusing lens 127 and the optical unit 123 and the position sensor 122 will affect the degree of clarity of the light spot track on the position sensor 122, but one Under a certain degree of blur, the position sensor 122 can still calculate the center of gravity of each light spot to form the light spot track TRC1.

In any embodiment of the present disclosure, the movement state ACT1 is up and down movement State, the motion state ACT2 is a state of swinging in a specific range on an x-y plane. The needle bar 121 also has a bur 136, which is detachably attached to the position of the needle head of the needle bar 121, and the user can appropriately replace the bur 136 according to the wear state of the needle 136. The position sensor 122 can be an optical position sensing unit. The optical unit 123 can be a self-luminous body or a non-self-luminous body. The light emitted by the self-luminous body and the non-self-luminous body can be divided into collimated light. And or non-collimated light (diffuse light). When the optical unit 123 is a self-luminous body and the light emitted by it is collimated light, the focusing lens 127 is not needed to focus the light LT1 to image the position sensor 122, otherwise, a focusing lens 127 is needed. When the optical unit 123 is a non-self-luminous body and the reflected light is collimated light, the focusing lens 127 is not needed to focus the light LT1 and image it on the position sensor 122, and the light LT1 can be directly projected on the position sensor 122. The position sensor comes up for imaging. When the optical unit 123 is a non-self-luminous body and the light emitted by it is diffuse light, a focusing lens 127 is needed to focus the light LT1 and image it on the position sensor 122. The non-self-luminous body may be a mirror, which reflects the collimated light or the diffused light. In some embodiments, the self-luminous body can be a light-emitting diode (LED), a laser diode (LD), or a bulb. The LED, LD, or bulb after being lit will emit diffuse light, which is focused The mirror 127 is projected and imaged on the position sensor 122 to form a light spot image IMG1, as shown in the first figure B, which is a schematic diagram of the preferred embodiment of the disclosure forming a light spot image IMG1 according to the first figure A. The monitoring device 12 also includes a power supply unit 126, a focusing lens 127, and a light shield 128. The power supply unit 126 is electrically connected to the optical unit 123 via a flexible wire FWR1 and provides power to the optical unit 123. The focusing lens 127 causes the diffused light emitted by the optical element 123 to form a light spot image IMG1 on the position sensor 122, and with the movement of the needle bar 121, the light spot image IMG1 forms a light spot track TRC1. The light shield 128 clamps the focusing lens 127 and the position sensor 122, and shields the interference of external light sources. The signal processing module 125 includes a signal extraction unit 1251 and a signal processing Unit 1252. The signal extraction unit 1251 converts the position coordinate signal SPT1(t) into a digital signal SD1(t). The signal processing unit 1252 calculates at least one of a position, a velocity, and an acceleration of the needle bar 121 according to the digital signal SD1(t), the position coordinate signal SPT1(t) and the digital signal SD1( The t) numbers are all functions of time.

In any embodiment of the present disclosure, the signal processing unit 1252 can be an analysis unit 1253. In the first image A, a light is formed at the position P on the position sensor 122 at a first time t1. Point PL, so that the position sensor 122 generates a position coordinate signal SP, a light point RL is formed at the position of the R point on the position sensor 122 at a second time t2, and the position sensor 122 A position coordinate signal SR is generated, a light spot QL is formed at the Q point position on the position sensor 122 at a third time t3, and the position sensor 122 generates a position coordinate signal SQ, and then the signal is captured The fetching unit 1251 converts the position coordinate signals SP, SR, and SQ into digital signals SDP, SDR, and SDQ respectively. Among them, SPT1(t1), SPT1(t2), SPT1(t3) are SP, SR, SQ, and SD1(t1), SD1(t2), SD1(t3) are respectively SDP, SDR, SDQ.

In addition, the needle bar 121 preferably vibrates up and down with a fixed vibration and swings within a specific plane range. The analysis unit 1253 can be used when the light points PL, RL, and QL are projected to the position sensor. The position of the needle bar 121 can be judged at points t1, t2, and t3, and the speed and acceleration of the needle bar 121 can be obtained by analyzing these signals SD1(t1), SD1(t2), SD1(t3). For example, the digital signal SD1(t1) has the position coordinate A of point P, SD1(t2) has the position coordinate C of point R, and SD1(t3) has the position coordinate B of point Q, then the light point PL will start from point P at time t1. The speed VPR from position to point R is (the distance between position coordinate C and position coordinate A) ÷ (t2-t1), and the speed VPR is differentiated with respect to time. Then the light spot PL is from P point to R at time t1 Acceleration APR at the point position. Similarly, the speed VRQ of the light spot RL from the position of point R to the position of point Q at time t2 is (position coordinate B to position The distance between coordinates C) ÷ (t3-t2), and the speed VRQ is differentiated with respect to time to obtain the acceleration ARQ of the light spot RL from the position of the R point to the position of the Q point at the time t2. That is, the analysis unit 1253 calculates a speed information of the needle bar 121 according to the position coordinate signal and SP and/or SQ, and the time points t1, t2, and t3 when the light LT1 is projected on the position sensor 122 , And at least one of acceleration information.

Please refer to the second figure A, which is a schematic diagram of another monitoring device 14 for monitoring a sewing machine 10 according to another preferred embodiment of the present disclosure, which is roughly the same as the monitoring device 12 in the first figure A, except for the difference The optical unit 129 used can be an LED light source with a diffuse light and a narrow-band light source or a laser (LD) light source to form a light spot image IMG2, and the monitoring device 14 further includes a focusing lens A filter 130 after 127 can further avoid interference from external light sources. The light spot of the lit LED or LD passes through the focusing lens 127, and then passes through the filter 130 to form a light spot image IMG2 on the position sensor 122, as shown in the second figure B, which is a preferred implementation of this disclosure For example, according to the second image A, a schematic diagram of another light spot image IMG2 is formed. For example, the narrow-band light source can be light in a specific frequency band, such as infrared light or ultraviolet light, etc., and the filter 130 can cooperate with the light in the specific frequency band to select a filter 130 of a specific wavelength band. For example, only infrared light can be used. A filter 130 through which light or ultraviolet light passes. The filter 130 can also be placed between the optical unit 129 and the focusing lens 127 to achieve the same effect.

Please refer to the third figure, which is a schematic diagram of another monitoring device 16 for monitoring a sewing machine 10 according to another preferred embodiment of the present disclosure. The optical unit 131 is a collimated light source. The monitoring device 16 also includes a power supply unit 126 and a light shield 128. The power supply unit 126 is electrically connected to the optical unit 131 via a flexible wire FWR1 and provides a power to the optical unit 131. The light shield 128 clamps the position sensor 122 and shields the interference from outside light sources. The light The learning unit 131 can be a laser collimated light directly projecting the light LT3 onto the position sensor 122 to form the light spot track TRC1. The monitoring device 16 in the third figure is roughly the same as the monitoring device 12 in the first figure A, except that the optical unit 131 used is a collimated light source, because the light LT3 emitted by it is a collimated light. Therefore, the focusing lens 127 may not be needed, and the optical unit 131 can directly project the collimated light LT3 onto the position sensor 122 to form the light spot, and with the movement of the needle bar 121, the light spot forms a light spot track TRC1. In some embodiments, the optical unit 131 can also use laser light with a specific wavelength or frequency, such as red laser light or green laser light, and then select a filter 130 that filters a specific wavelength band to further avoid external light sources. Interference. The filter 130 is placed between the optical unit 131 and the position sensor 122.

Please refer to Figure 4, which is a schematic diagram of another monitoring device 18 for monitoring a sewing machine 10 according to another preferred embodiment of the present disclosure. The optical unit 133 is a mirror. The monitoring device 18 also includes a first light source unit 132 with a large area. Under the condition that the first light source unit 132 emits a collimated light CM1 to the mirror, the optical The unit 133 does not need a power supply, and does not need a focusing lens 127, and the collimated light CM1 emitted by the optical unit 132 is reflected by the optical unit 133 to project the light LT4 onto the position sensor 122 to form the light spot With the movement of the needle bar 121, the light spot forms a light spot track TRC1.

Please refer to the fifth figure, which is a schematic diagram of another monitoring device 19 for monitoring a sewing machine 10 according to another preferred embodiment of the present disclosure. When the optical unit 135 is a diffuse reflector or a mirror, the monitoring device 19 further includes a second light source unit 134, wherein the second light source unit 134 emits a non-collimated light NCM1 to the diffuse mirror Under the condition of 135, the optical unit 135 does not need the power supply, Then the diffused light LT5 can be emitted, but the diffused light LT5 needs to be projected onto the position sensor 122 through the focusing lens 127 to form the light spot image. With the movement of the needle bar 121, the light spot forms a light spot track TRC1 . The second light source unit 134 can be general ambient light without power supply.

Please refer to the sixth figure, which is a schematic diagram of the method S10 for monitoring a sewing machine 10 according to a preferred embodiment of the present disclosure. Please refer to the first, second, third, fourth, and fifth figures in combination, in which the sewing machine 10 There is a needle bar 121, and the needle bar 121 has a motion state ACT1, ACT2, and includes an optical unit 123, 129, 131, 133, 135, a fixing mechanism 124, a position sensor 122, and a signal processing module 125. The method includes the following Steps: Step S101, the optical units 123, 129, 131, 133, 135 that emit a light beam LT1, LT2, LT3, LT4, LT5 are fixed to the needle bar 121 via the fixing mechanism 124, so that the light beams LT1, LT2 are moved when the needle bar 121 moves , LT3, LT4, LT5 form a light spot track TRC1 on the position sensor 122. Step S102, by using the position sensor 122, the light spot trajectory TRC1 is converted into a position coordinate signal SPT1(t) in response to the light spot trajectory TRC1. In step S103, a movement track of the needle bar 121 is analyzed based on the position coordinate signal SPT1(t).

In any of the embodiments of the present disclosure, please refer to the first, second, and fifth figures together. The method S10 is applied to a monitoring device 12, 14, 19, and the monitoring device 12, 14, 19 also includes a focus Mirror 127 and a light shield 128. The method S10 further includes the following steps: by using a flexible wire FWR1 to provide a power to the optical unit 123, 129, 135; by using the light shield, clamping the focusing lens and the position sensor Detector, and shield the interference of external light source; emit the light LT1, LT2, LT5 to the focusing lens 127, and by using the focusing lens 127, the light LT1, LT2, LT5 is projected on the position sensor to Forming a light spot image, wherein the light spot image forms the light spot track along with the movement of the needle bar; converting the position coordinate signal SPT1(t) into a digital signal SD1(t); and At least one of a position, a velocity, and an acceleration of the needle bar 121 is calculated according to the digital signal SD1(t).

In any embodiment of the present disclosure, please refer to the fourth figure. The method S10 is applied to a monitoring device 18. When the light-emitting unit 133 is a mirror, the monitoring device 18 also includes a large area. The first light source unit 132, the method S10 further includes the following steps: making the first light source unit 132 emit a collimated light CM1 to the reflector; making the reflector directly project the collimated light LT4 to the position sensor 122 To form the light spot track TRC1. The collimated light CM1 is parallel light, and the first light source unit 132 can emit light parallel to each other in a wide range.

In any embodiment of the present disclosure, please refer to the fifth figure. The method S10 is applied to a monitoring device 19. When the optical unit 135 is a diffuse reflector or a mirror, the monitoring device 19 also includes a The second light source unit 134. The method S10 further includes the following steps: making the second light source unit 134 emit a non-collimated light NCM1 to the optical unit 135; using the focusing lens 127 to make the diffused light LT5 reflected by the optical unit 135 project to the position The light spot image is formed on the sensor 122, and the light spot image forms a light spot track TRC1 along with the movement of the needle bar 121.

Please refer to Figure 7, which is a schematic diagram of a monitoring method S20 for monitoring a movement and a state of a needle bar of a sewing machine according to a preferred embodiment of the present disclosure. A ray of light moving due to the movement; step S202, by projecting the ray on a position sensor to form a moving light spot so that the position sensor generates a position coordinate signal; and step S203, corresponding to the position The coordinate signal analyzes a movement trajectory of the needle bar.

Please refer to the eighth figure, which is a schematic diagram of a monitoring device 22 for monitoring a sewing machine 20 according to a preferred embodiment of the present disclosure, wherein the sewing machine 20 has a needle bar 221, and the needle bar 221 has a The motion state ACT3, ACT4, the monitoring device 22 includes an optical unit 223, a position sensor 222, and an analysis unit 225. The optical unit 223 is disposed on the needle bar 221 and projects a light LT6. The position sensor 222 receives the light LT6 and generates a position coordinate signal SPT2(t2) that reflects the light LT6 at a specific time point t2. Among them, before the position coordinate signal SPT2(t2), there is at least one adjacent position coordinate signal SPT2(t1)=SP; after the position coordinate signal SPT2(t2), there is at least one adjacent position coordinate signal SPT2(t3=)SQ . According to the position coordinate signal and SP and/or SQ, the analysis unit 225 analyzes whether the motion states ACT3 and ACT4 are normal.

In any embodiment of the present disclosure, the movement state ACT3 is a state of up and down movement, and the movement state ACT4 is a state of swinging in a specific range on an x-y plane. The needle bar 121 also has a bur 136, which is detachably attached to the position of the needle head of the needle bar 121, and the user can appropriately replace the bur 236 according to the wear state. The position sensor 222 may be an optical position sensing unit, the optical unit 223 may be a light emitting diode (LED) or a laser diode (LD) or a bulb, and the monitoring device 22 may also include A power supply unit 226, a focusing lens 227, and a light shield 228. The power supply unit 226 is electrically connected to the optical unit 223 via a flexible wire FWR2, and provides a power to the optical unit 223. The focusing lens 227 projects the light LT6 onto the position sensor 222 to form the light spot trajectory TRC2 synchronized with the movement of the needle bar 221. The light shield 228 clamps the focusing lens 227 and the position sensor 222, and shields the interference of external light sources. The signal processing module 225 includes a signal extraction unit 2251 and a signal processing unit 2252. The signal capturing unit 2251 converts the position coordinate signal SPT2(t) into a digital signal SD2(t). The signal processing unit 2252 calculates at least one of a position, a velocity, and an acceleration of the needle bar 221 according to the digital signal SD2(t), the position coordinate signal SPT2(t) and the digital signal SD2( The t) numbers are all functions of time.

The monitoring device 22 in the eighth figure is similar to the embodiments of the monitoring devices 12, 14, 16, 18, 19. The optical unit 223 can use a collimated light source, such as a collimated laser light, and the focusing lens 227 can be omitted. For narrow-band luminous bodies or light sources, a filter can be added to further avoid interference from external light sources. When the optical unit 223 is a reflector, a large-area collimated light source can be used in combination with the reflector to form a light spot projection module. The light emitting diode or laser diode of the optical unit 223 can be omitted, and it is flexible. The wire FWR2 can also be omitted, which can prevent the needle bar 221 from being restrained or affected by the power cord of the flexible wire FWR2 when the needle bar 221 moves up and down or/and swings left and right, such as the winding of the power cord. When the light spot projection module uses a general light source combined with a diffuse mirror, a focusing mirror is required to focus and project the light on the position sensor 222.

Please refer to Figure 9, which is a schematic diagram of a method S30 for monitoring a sewing machine according to a preferred embodiment of the present disclosure. The sewing machine has a needle bar and the needle bar has a movement state. The method S30 includes: step S301, A light is projected from the needle bar; step S302, receiving the light and generating a position coordinate signal SR that reflects the light at a specific time point, wherein at least one immediately adjacent position coordinate signal SP is provided before the position coordinate signal SR, and After the position coordinate signal SR, there is at least one adjacent position coordinate signal SQ; and step S303, based on the position coordinate signal and SP and/or SQ, analyze whether the motion state is normal.

With the embodiment of the present disclosure, the needle bar cannot operate accurately due to factors such as the motor, the transmission mechanism or the cloth, and the problem that the preset stitch pattern cannot be successfully completed can be notified to the user in real time to eliminate the obstacle. The movement state of the needle bar can achieve the advantages of accurate monitoring and low cost.

Many modifications and other embodiments of the present disclosure presented here will be understood by those who are familiar with the art to have the benefits of the teachings presented in the above description and related drawings. Therefore, we should understand that this disclosure is not limited to the specific embodiments disclosed, and the modification and other implementations The examples are intended to be included in the scope of the following patent applications.

10‧‧‧Sewing machine

16‧‧‧Monitoring device

121‧‧‧Needle bar

122‧‧‧Position Sensor

131‧‧‧Optical Unit

ACT1,ACT2‧‧‧exercise status

124‧‧‧Fixed mechanism

125‧‧‧Signal processing module

126‧‧‧Power Supply Unit

P,Q,R‧‧‧Position

128‧‧‧ Lens Hood

1251‧‧‧Signal Extraction Unit

1253‧‧‧Analysis unit

1252‧‧‧Signal processing unit

FWR1‧‧‧Flexible wire

LT3‧‧‧Light

TRC1‧‧‧Spot Track

PL,QL,RL‧‧‧Light spot

Claims (9)

A monitoring device for monitoring a sewing machine, wherein the sewing machine has a needle bar and the needle bar has a movement state. The monitoring device includes: a position sensor; an optical unit that projects a light; and a fixing mechanism , For fixing the optical unit to the needle bar, so that the optical unit and the needle bar move synchronously when the needle bar moves, and the light emitted by the optical unit forms a light spot on the position sensor Trajectory, wherein the position sensor converts the light spot trajectory into a series of position coordinate signals in response to the light spot trajectory; and a signal processing module is connected to the position sensor and analyzes the position coordinate signal according to the position sensor A trajectory of the needle bar. As for the monitoring device described in claim 1, wherein: the position sensor is an optical position sensing unit; the optical unit is a self-luminous body, which includes a light-emitting diode (LED) or lightning The light emitting diode (LD) or light bulb moves synchronously with the needle bar of the sewing machine; the monitoring device also includes: a power supply unit electrically connected to the optical unit via a flexible wire, and provides a power to the optical unit Unit; a focusing mirror, so that the luminous line of the optical unit is projected on the position sensor to form a light spot image, and the light spot image forms the light spot track along with the movement of the needle bar; a light shield, Clamp the focusing lens and the position sensor, and shield the interference from outside light sources; and The signal processing module includes; a signal capture unit that converts the position coordinate signal into a digital signal; and a signal processing unit that calculates at least a position, a velocity, and an acceleration of the needle bar based on the digital signal one of them. According to the monitoring device described in item 2 of the scope of patent application, the optical unit has a narrow-band light source, and the monitoring device further includes a filter disposed behind the focusing lens to avoid interference from external light sources. The monitoring device described in item 1 of the scope of patent application, wherein: the optical unit has a collimated light source, which includes a collimated laser light and moves synchronously with the needle bar of the sewing machine; and the monitoring device further includes: a power supply The unit is electrically connected to the optical unit via a flexible wire, and provides a power to the optical unit; and a light shield, which clamps the position sensor and shields the interference from external light sources, wherein the optical unit directly projects The collimated light reaches the position sensor to form the light spot track. The monitoring device described in item 1 of the scope of patent application, wherein: the optical unit is a mirror and moves synchronously with the needle bar of the sewing machine, the monitoring device further includes a first light source unit with a large area, wherein the first light source unit is Under the condition that a light source unit emits a collimated light to the reflector, the optical unit does not need a power supply, and does not need a focusing lens, and the optical unit directly reflects the collimated light to the position sensor. Forming the light spot track; and when the optical unit is a diffuse mirror and moves synchronously with the needle bar of the sewing machine, the monitoring device The device further includes a second light source unit, wherein under the condition that the second light source unit emits a non-collimated light to the diffuse mirror, the optical unit does not need the power supply, but the diffuse mirror needs to pass through the The focusing mirror projects the light onto the position sensor to form the light spot track. A method for monitoring a sewing machine, wherein the sewing machine has a needle bar, and the needle bar has a movement state, and includes an optical unit, a fixing mechanism, a position sensor, and a signal processing module. The method includes the following steps: fixing the optical unit that emits a light beam to the needle bar through the fixing mechanism, so that the light beam forms a light spot track on the position sensor when the needle bar moves: by using The position sensor converts the light spot trajectory into a position coordinate signal in response to the light spot trajectory; and analyzes a movement trajectory of the needle bar in response to the position coordinate signal. The method described in item 6 of the scope of patent application, wherein: the method is applied to a monitoring device, the monitoring device further includes a focusing lens and a light shield, and the method further includes the following steps: by using a flexible wire, Provide a power to the optical unit; by using the hood, clamp the focusing lens and the position sensor, and shield the interference from the external light source; the light emitted by the optical unit uses the focusing lens to make the light Projected onto the position sensor to form a light spot image, wherein the light is diffuse light, and the light spot image forms the light spot track along with the movement of the needle bar; converts the position coordinate signal into a digital signal; as well as At least one of a position, a velocity, and an acceleration of the needle bar is calculated according to the digital signal. The method according to item 6 of the scope of patent application, wherein: when the optical unit is a mirror, the monitoring device further includes a first light source unit with a large area; the method further includes the following steps: A light source unit emits a collimated light to the reflector; and causes the reflector to directly reflect the light to the position sensor to form the light spot track; and when the light-emitting unit is a diffuse reflector or reflector When the monitoring device further includes a second light source unit; the method further includes the following steps: making the second light source unit emit a non-collimated light to the diffuse reflector or mirror; using the focusing mirror to make the diffuser The light reflected by the reflector or mirror is projected onto the position sensor to form the light spot track. A monitoring method for monitoring a state of a movement of a needle bar of a sewing machine includes the following steps: using an optical unit to emit a light that moves with the movement; and projecting the light to a position sensing On the device, a moving light spot is formed so that the position sensor generates a position coordinate signal; and in response to the position coordinate signal, a movement track of the needle bar is analyzed.

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